Nasty odors in the fridge can be disgusting and really put you off your food; but how to get rid of them? In fact, you can use lemon to conquer the odor and make your fridge smell fresh. All you need to do is to cut a lemon into slices and place the sliced lemon on the shelves of the fridge. The odor-absorbing property of the lemon will help remove the bad smells. However, remember to replace the lemon at least once a week. Otherwise, it will rot.